Ventilating device



Patented Aug. 7, 179.28.

ARTHUR F. KNOWLES, or UPPERMONTCLAIR, NEW JERSEY.

VENTILATING DEVICE.

Application mea ,october .6, 192e. aerialk No. 139,817.

rIhe invention relates to diffusers mounted at thev outlet orifices of air conduits serving to supply air to auditoriums, school rooms and the like, and is based on Letters Patent to I-Iattie A. Knowles, executrix of George E. Knowles, dated Jan. 30, 1917, No. 1,213,884.

The object of the invention is to provide a device analogous to that shown in they above patent, in which the flow of air from the conduit is practically unobstructed in all directions and in which t-he advantages of adjustment are retained and so disposed as to occupy less vertical height than required by the structure shown in said patent.

The invention consists in certain novel features of construction and arrangement of parts by which the above objects are attained, to be hereinafter described and claimed.

The accompanying drawings form a part of this specification and showy the invention as it has been carried out in practice. l

Figure 1 is a plan viewy of the diffuser with certain portions broken away and partly in horizontal section.

Figure 2 is a vertical section takenV on the line 2-2 in Figure 1, and partly in elevation. l

Similar reference numerals indicate like parts in both the figures.

As shown in the drawings the device consists of two main portions, a base 5 and a bell or cover 6 joined by a single screw 7.

The base 5 is an o en cylinder having a horizontal exterior ange 8 at about the midheight, by which the base may be secured to a floor by screws, notshown, or is provided with lugs 9 adapted to be imbedded in a concrete or cement floor and thus hold the base lirmly with its cylindrical portion lying closely within the conduit opening 10.

On the interior of the cylindrical wall of the base 5 are equally spaced thickened poro tions 11, preferably three in number, each of which extends as a vertical lug 12 below the lower edge of the base. These thickened portions extend to the top edge of the basel and each is formed witha series of gradually ascending serrations formed as deep notches or partial recesses 13 arranged spirally vand each series similar to the others, and from the junction ofreach thickened portion with the interior of the base 5 extends la radially disposedV spider arm 14 all .of which unite in a central hub or boss 15 preferably-on a level i with the upperedge of thebase 5. j Y

All these parts constituting the base are preferably in a sin le casting but may be separate pieces suitaly joined.

The bell or cover 6 is a hollow flattened dome-shaped casting of greater diameter than the base 5 and is provided with three equally spaced .downwardly projecting leg members or fins 16' having thin lower ends adapted to engage in the steps or notches 13,

and formed with an internal boss 17, drilled i and countersunk to receive the shank of a long screw 7 adapted to engage a correspondingly threaded hole drilled and tapped in the boss 15 of the base.

Thus arranged, the bell 6 may be held supported at any height desired above the base within the range of the Vse'rrations 13 by loosening the screw 7 and engaging the members 16 in the desired notches 13 and again tlghtemng the screw. In the drawing the bell 6 is shown at its highest elevation withv its legs 16 engaged in the uppermost notch`13 V of each series; the dotted lines show the bell in an intermediate position, and by engaging the legs in the lowermost notches the periphery of the bell will rest upon the base-flange 8 and the flow from thefconduit pening 10 will be stopped. It will be noted that with the exception of the thin legs 16 there arel no obstructions tothe lateral flow of Vair between the rim of the bell 6 andupper edge of the base 5, in any of the open positions, thus insuring the desired diffusion yof air without perceptible currents in any one direction.

The improved construction permits the bell 6 to be considerably reduced in height, effecting a corresponding reduction in the height of the device when in position. The

serrations or notches 13 are preferably rounded so as to be easily cast while the depth is suiicient to insure reliable engage- .ment with the legs 16 when the screw 7 is tightened, and such engagement locks the screw against accidental loosening.

I claim t-. 1

1. In `a device of the character set forth, a hollow cylindricalV base, a plurality of series of ascending serrations disposed spirallyon the annular linterior of said base 'concentrically thereto and below the upper edge thereof, a bodily rotatable cover located above said base, downwardly projectthereof, a cover located above said base, downwardly projecting spaced legs formed integrally with said cover and adapted to engage With the notches of said steps, a centrally located boss on the interior ofvsaid cover, a centrally located boss in said base, and a screw extended through said bosses to hold said cover to said base.

In testimony that I claim the invention alcove set forth, l alliX my signature hereto.

ARTHUR r. KNoWLEsl 

